I know you can only take a 10kg bag plus handbag on the six-seater planes (my stuff wasn't weighed), but be aware that anything you need to buy in Canaima i.e. booze is amazingly expensive. Beers 10Bs a can. I paid 80Bs for two rum & cokes...
Do a bit of research into where you will be staying in Canaima. There are a couple of very swish places with fantastic views, but the rest are more basic. I overheard some European people in a group who were very unhappy with their accommodation taking into account the price they had paid."This is just NOT good enough..."
If you go up to stay at Angel Falls expect things to be basic. There will be food and "some" water. Take any booze but also take some extra water for cleaning your teeth etc. Don't forget the guide companies have to lug the stuff up there.
(Ear plugs are a must... snorers...)
I also recommend taking the tractor & trailer option on the way up; the walk is a bit of a slog. In the canoe our guide allowed us to spend some of the trip sitting on our life-jackets, but other groups were not allowed to, the nearly three hours sitting on a small hard wooden bench is not much fun... Shoes get wet...
I went to Canaima in August 2009. There were lots of mozzies. We didn't have to portage on the river trip up to Angel Falls but the boat was bottoming a lot. I can imagine that in drier times of the year there would be considerable scrambling up through the rocks. I was told that earlier in the year tourists were arriving with no idea that due to the lack of river flow it was impossible to get up to Angel Falls. The locals in Canaima had to put up with a lot of criticism when, in their opinions, the European travel agents should have been informing their clients.
We arrived in the afternoon and trekked up to the viewpoint (me 50 mins, my wife 1.30 hrs) - sunny and clear. The next morning the falls were covered in mist... tough on the group that had stayed the night with the plan to trek up then.
Of the gift shops the one nearest the airport was the most reasonably priced.
All in all we had a great visit. We had a great time.
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